Field Observation party on the New Mexico State University Calibration Base Line (NMSU CBL).
On May 13th and 14th, 2003, in conjunction with the National Geodetic Survey, field observations were made on the NMSU calibration baseline
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The baseline is located along Triviz Dr., just east of the PanAm Center. Precise measurements were made using two Leica electronic distance measuring instruments. Meteorological data is observed repeatedly through the process to compute the needed corrections caused in the air mass between stations. |
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The baseline consists of brass tablets set in concrete at 0 meters, 150 meters, 430 meters and 1030 meters. The above monument illustrates the use of “white out” to illuminate the true point on the monument. Extreme care is used for precise collimation over the points. |
The observation team as viewed from the reflector station. In this photograph, the reflector and tripod in the foreground are set at the 0M point, the observation team (under the orange umbrella) are at the 150M point. |
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During observations, the instrument is shaded at all times. As the NGS Umbrella is staked to the ground by Hammer-man Dave, the instruments is being setup by Bill. Meanwhile, Christian is learning the data collector features from Marsha. |
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Precisely calibrated retroreflector prisms are mounted on specially adapted tribrachs and tripods. |
Right to left: NM NGS Advisor Bill Stone, AZ NGS Advisor Dave Minkel, Christian Clausen, Marsha Miller (facing away). |
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Observations are underway! |
“Met data” observed includes temperature, barometric pressure and relative humidity. Samantha and Bill above posing as Earl Burkholder radios the temperature and pressure to the recorder. Temperature is precisely measured with specially designed termistors seen on the tripod above. |
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Thermistors are set above the reflectors and instrument to minimize the effects at the surface. Met data is observed at both ends of the line for each measurement. |
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Dr. Wurm would like to extend a sincere “Thank You” to the National Geodetic Survey and all volunteers involved. Thanks to your efforts, this baseline will be available for the use of the surveying profession for many years to come. When the observations have been adjusted and published, a link will be provided here to access the dataset.
CHECK BACK SOON!
Page modified June 6, 2003,
kbw